GNU Collaborative International Dictionary of English

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1.       
   Spine , n. [L. spina thorn, the spine; akin to spica a point: cf. OF. espine, F. épine. Cf. Spike, Spinet a musical instrument, Spinny.]
   (Bot.) A sharp appendage to any of a plant; a thorn.
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   (Zool.) (a) A rigid and sharp projection upon any part of an animal. (b) One of the rigid and undivided fin rays of a fish.
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   (Anat.) The backbone, or spinal column, of an animal; -- so called from the projecting processes upon the vertebrae.
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   Anything resembling the spine or backbone; a ridge.
   1913 Webster